Proceedings of the Geologists Association最新文献_第2页

Skull roof anatomy of the Early Jurassic (Toarcian) acipenseriform †Gyrosteus mirabilis Woodward ex Agassiz, from Yorkshire, England, elucidates diversity of †Chondrosteidae 来自英国约克郡的早侏罗世（Toarcian）蛇形†Gyrosteus mirabilis Woodward ex Agassiz的头骨顶解剖，阐明了†软骨steidae的多样性

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-01-09 DOI: 10.1016/j.pgeola.2024.12.004

Samuel L.A. Cooper , Megan Jacobs , Lucrezia Ferrari , David M. Martill

{"title":"Skull roof anatomy of the Early Jurassic (Toarcian) acipenseriform †Gyrosteus mirabilis Woodward ex Agassiz, from Yorkshire, England, elucidates diversity of †Chondrosteidae","authors":"Samuel L.A. Cooper , Megan Jacobs , Lucrezia Ferrari , David M. Martill","doi":"10.1016/j.pgeola.2024.12.004","DOIUrl":"10.1016/j.pgeola.2024.12.004","url":null,"abstract":"<div><div>An articulated and mostly complete skull roof of the enigmatic Early Jurassic chondrosteid fish, <sup>†</sup><em>Gyrosteus mirabilis</em> Woodward ex Agassiz is described from the Whitby Mudstone Formation (Toarcian) of Whitby, Yorkshire. Known since the 1830s, isolated bones attributable to this taxon are frequently found along the Whitby coast, although articulated remains are rarely reported. The fragmentary nature of <em>Gyrosteus mirabilis</em>, the largest non-reptilian animal from the British Lower Jurassic, has led some researchers to propose it as a subjective synonym of <sup>†</sup><em>Chondrosteus</em> Egerton ex Agassiz, from the Lower Lias of Dorset, and others to suggest synonymy with the similarly massive <sup>†</sup><em>Strongylosteus</em> Jaekel from the Upper Lias (Toarcian) of Germany. Here, we compare the skull roof anatomies of <sup>†</sup><em>Gyrosteus mirabilis</em> with <sup>†</sup><em>Chondrosteus acipenseroides</em> and <sup>†</sup><em>Strongylosteus hindenburgi</em> and present new criteria to differentiate between these taxa. We find the skull roofs of <em>Chondrosteus</em> and <em>Strongylosteus</em> to be vastly different with <em>Gyrosteus</em> representing something of an ‘intermediate’ morphology with closer affinities to <em>Strongylosteus</em>. The presence of a medial parietal and rostral bones is shared between <em>Gyrosteus</em> and <em>Strongylosteus</em> but these are absent in <em>Chondrosteus</em>. Our results support the taxonomic validity of both <em>Gyrosteus mirabilis</em> and <em>Strongylosteus hindenburgi</em> as monotypic genera distinct from <em>Chondrosteus acipenseroides</em>.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 3","pages":"Article 101089"},"PeriodicalIF":1.2,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Refining the known extent of major onshore Quaternary glaciation in the UK — Types of evidence, nomenclature and uncertainty 细化英国主要陆上第四纪冰川的已知范围——证据类型、命名法和不确定性

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-24 DOI: 10.1016/j.pgeola.2024.12.002

Jonathan R. Lee , Sam Roberson

{"title":"Refining the known extent of major onshore Quaternary glaciation in the UK — Types of evidence, nomenclature and uncertainty","authors":"Jonathan R. Lee , Sam Roberson","doi":"10.1016/j.pgeola.2024.12.002","DOIUrl":"10.1016/j.pgeola.2024.12.002","url":null,"abstract":"<div><div>Repeated cycles of Quaternary glaciation have had a major impact on the morphology and shallow sub-surface properties of much of the UK landscape and continental shelf. Understanding the extent of glaciation involves understanding of our landscape history but is also critical to the broad range of applied users that interact with the shallow sub-surface including engineers, hydrogeologists, planners and decision makers. Numerous interpretations of the onshore extent of the Anglian and Late Devensian glaciations have been published. However, many are not clearly evidenced or justified, being sometimes based on anecdotal evidence or supposition, with the levels of associated uncertainty not effectively communicated. As part of this work, the long-term record of Quaternary glaciation within the UK is reviewed and the types of geological and geomorphological information that can be employed to interpret their former extent are assessed. We also examine the range of factors that may influence the relative preservation of this evidence. As part of this assessment, we recommend abandoning the term ‘glacial limit’ (and other related synonyms) when interpreting the extent of glaciation within the geological record. Instead, we recommend using the term <em>limit of preserved evidence</em> which more accurately reflects the spatial context of such evidence. Finally, we present new onshore linework for the limit of preserved evidence of both the Anglian and Late Devensian glaciations, presenting how this linework was captured and the associated levels of uncertainty.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 3","pages":"Article 101087"},"PeriodicalIF":1.2,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soft-sediment deformation structures of tide origin: A case study from the late Miocene Tafna Basin (NW Algeria) 潮源软沉积变形构造——以晚中新世Tafna盆地为例

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-18 DOI: 10.1016/j.pgeola.2024.12.001

Mostapha Benzina , Abdelmalik Draoui , Hakim Hebib , Małgorzata Pisarska-Jamroży

{"title":"Soft-sediment deformation structures of tide origin: A case study from the late Miocene Tafna Basin (NW Algeria)","authors":"Mostapha Benzina , Abdelmalik Draoui , Hakim Hebib , Małgorzata Pisarska-Jamroży","doi":"10.1016/j.pgeola.2024.12.001","DOIUrl":"10.1016/j.pgeola.2024.12.001","url":null,"abstract":"<div><div>Typical liquefaction-induced soft-sediment deformation structures were recognised in the Neogene-age tide-dominated estuarine sedimentary succession Bled El Trayfa in the Tafna basin (NW Algeria). Although NW Algeria was tectonically active during late Neogene, we suggest that another trigger mechanism that is not related to earthquakes is responsible for the liquefaction phenomenon and the development of soft-sediment deformation structures in the area. The sedimentary succession called the Bled El Trayfa exhibits tidal rhythmites, heterolithic beddings, bi-directional cross-laminae, and tidal bore couplets deposited in tidal flats within the intertidal environment. A tidal bore, defined as upstream-propagating hydraulic jumps associated with the flood tide in estuarine rivers, is proposed as the main trigger mechanism responsible for the liquefaction phenomenon and the development of soft-sediment deformation structures. This suggestion was made on a set of observed arguments: firstly, the presence of draping massive sand underlain by erosional surfaces indicating scouring by upstream-propagating bores, followed by a very rapid deposition in a tide-dominated estuarine from the intertidal environment and secondly, the formation of distinctive (typical) soft-sediment deformation structures, characterised by convoluted and folded structure like flow rolls along with associated dewatering structures. Alongside flow rolls as typical and dominant soft-sediment deformation structures, the succession also includes load casts, recumbent folds, water-escape structures, convolute laminations, ball-and-pillow structures, and flame structures. Even though the relationship between the tidal bore and sediment deformation structures has been proved in some current researches, the Bled El Trayfa succession was considered among the rare areas where this relationship was identified as the origin of SSDSs in ancient rock record.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 3","pages":"Article 101086"},"PeriodicalIF":1.2,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A detailed investigation into the legacy of glacial readvances and ice-dammed lakes around Sellafield, West Cumbria: Implications for 3D modelling, hydrogeology and ground engineering 对西坎布里亚郡塞拉菲尔德周围冰川推进和冰坝湖泊遗产的详细调查：对3D建模、水文地质学和地面工程的影响

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.11.001

Jon W. Merritt , Nicholas T. Smith , Emrys Phillips , Clive A. Auton

{"title":"A detailed investigation into the legacy of glacial readvances and ice-dammed lakes around Sellafield, West Cumbria: Implications for 3D modelling, hydrogeology and ground engineering","authors":"Jon W. Merritt , Nicholas T. Smith , Emrys Phillips , Clive A. Auton","doi":"10.1016/j.pgeola.2024.11.001","DOIUrl":"10.1016/j.pgeola.2024.11.001","url":null,"abstract":"<div><div>The glacial evolution of western Cumbria, England is reassessed following a comprehensive review of both published and extensive unpublished records from the Sellafield area, together with targeted fieldwork. The exercise scrutinises evidence for glacial readvances across former ice-dammed lakes, determining their occurrence, relative age, extent and legacy. It is concluded that the area was affected by at least two substantial glacial readvances following the maximum build-up of ice during the last, Late Devensian (Weichselian/Wisconsin) glaciation. The earlier Gosforth Oscillation involved locally sourced ice together with ice that circulated around the north of the Lake District into the Irish Sea basin whilst most of the region was substantially glaciated. The subsequent Fishgarth Wood Readvance involved ice flowing from the north, but when an ice centre positioned over the western Southern Uplands of Scotland had become dominant. Glacial oscillations across the coastal plain have resulted in a complex interdigitating sequence of sediments of contrasting permeability and physical properties, commonly preserved within buried valleys. The genesis of some thin units of clay-rich diamicton and pebbly clay previously interpreted as till is discussed in the light of ongoing debate concerning their possible glaciolacustrine origin.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 6","pages":"Pages 695-743"},"PeriodicalIF":1.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The aberrant crinoid Cyathidium (Echinodermata, Crinoidea, Cyrtocrinida) from lower Campanian phosphatic chalk in West Sussex (UK) and Picardie (France) 英国西萨塞克斯郡和法国皮卡迪省下坎帕尼亚期磷化白垩中的异常棘皮动物Cyathidium（棘皮动物门，Crinoidea，Cyrtocrinida

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.07.001

Andy S. Gale , John W.M. Jagt

引用次数: 0

A new sun star (Echinodermata, Asteroidea, Solasteridae) from the mid-Miocene of Lacoste, France 法国Lacoste中新世发现的一颗新太阳星（棘皮亚，星形总科，太阳星科）

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.10.001

Andrew S. Gale , David J. Ward

引用次数: 0

A large pterosaur from the Middle Jurassic (lower Bajocian) of Rutland, United Kingdom 来自英国拉特兰中侏罗世（下巴约西亚）的一种大型翼龙

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.09.003

Darren Withers , David M. Martill , Roy E. Smith , Michael Ashton , Anusuya Chinsamy , Charles Wood , Richard Forrest

引用次数: 0

Enigmatic trace fossil from the Middle Jurassic Ravenscar Group of Yorkshire, England 来自英格兰约克郡中侏罗世拉文斯卡群的神秘化石

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.09.004

David M. Martill , Danielle Milbank , Mike Romano , Roy E. Smith

引用次数: 0

Deformation of terrace surfaces in the Bystrzyca River valley, central Sudetic Foreland, SW Poland 波兰西南部苏台德前陆中部Bystrzyca河谷阶地表面的变形

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.09.002

Dariusz Krzyszkowski , Lucyna Wachecka-Kotkowska , Marcin Krawczyk , David Bridgland

{"title":"Deformation of terrace surfaces in the Bystrzyca River valley, central Sudetic Foreland, SW Poland","authors":"Dariusz Krzyszkowski , Lucyna Wachecka-Kotkowska , Marcin Krawczyk , David Bridgland","doi":"10.1016/j.pgeola.2024.09.002","DOIUrl":"10.1016/j.pgeola.2024.09.002","url":null,"abstract":"<div><div>This article addresses the development of Pleistocene terraces in the Bystrzyca River catchment (Sudetic Foreland, Southwestern Poland) in the vicinity of the Sudetic Marginal Fault, within the Roztoka–Mokrzeszów Graben. Nineteen research sites located within the Świdnica Plain are documented in this paper, representative of terraces of the Bystrzyca and its Piława and Witoszówka tributaries, with reporting on analyses of structure, grain size, petrography, quartz-grain morphoscopy, and heavy minerals. The Bystrzyca River, flowing in the largest and deepest valley in the Sowie Mountains, crossing the fault zone and extending into the Sudetic Foreland, has been influenced by significant tectonic and glacial events. During the Middle Pleistocene a fluvial piedmont fan was formed and survives as traces of higher-level (pre-Saalian) terraces. The main fluvial terraces are recognized as follows: an Upper Terrace, from the Saalian, a Middle Terrace from the Upper Pleistocene Last Glacial (Weichselian) and, in the valley bottom, a Lateglacial–Holocene Lower Terrace and a Holocene Lowermost Terrace. The sediments forming these terraces document a complex history of tectonic uplift, glacio-isostatic rebound, and climatic changes. Notable features include a sequence of alluvial fans and terraces shaped by neotectonic activity, particularly during the Late Quaternary.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 6","pages":"Pages 639-659"},"PeriodicalIF":1.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New information on the Dyrham Formation (Lower Jurassic, Pliensbachian) of the East Midlands Shelf, UK 英国东米德兰兹大陆架 Dyrham 地层（下侏罗统，普利恩巴赫统）的新信息

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-10-01 DOI: 10.1016/j.pgeola.2024.08.004

Robin I. Knight

{"title":"New information on the Dyrham Formation (Lower Jurassic, Pliensbachian) of the East Midlands Shelf, UK","authors":"Robin I. Knight","doi":"10.1016/j.pgeola.2024.08.004","DOIUrl":"10.1016/j.pgeola.2024.08.004","url":null,"abstract":"<div><div>Previously unpublished Lower Jurassic sections of the East Midlands Shelf, along with reassessment of museum collections and previously published successions, indicate that seafloor sedimentation was dominated by complex erosional and depositional processes driven by dynamic and complex shelfal seafloor energy regimes during the Davoei and Margaritatus Zones of the Pliensbachian. The possible influence of tectonically driven relative sea level fluctuations is uncertain. Distinct condensation events, marked by authigenic mineralisation and clast reworking, can be identified at the Davoei–Margaritatus zonal boundary at the base of the Stokesi Subzone (‘Lower Authigenic Mineral Bed’), and at the boundary between the Stokesi and Subnodosus Subzones (‘Upper Authigenic Mineral Bed’). These correspond to a recognised candidate sequence boundary and candidate maximum flooding surface respectively. The Stokesi Subzone is well defined in all the studied sections by the ammonites between the two marker beds, whilst the Subnodosus Subzone can only be proven at Middleton Cheney. Nutrient supply for mineralisation observed in the ‘Authigenic Mineral Beds’ was derived from the erosion of uppermost Davoei Zone and lowermost Stokesi Subzone sediments. The high concentrations of authigenic mineralisation ions in the Davoei sediments were generated by large amounts of organic material derived from continental run-off.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 5","pages":"Pages 545-568"},"PeriodicalIF":1.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0